Swimming aid



FIG. 1 is a top perspective view of a swimming aid showing my new design;

FIG. 2 is an end view thereof;

FIG. 3 is a bottom perspective view thereof; and,

FIG. 4 is a view of the swimming aid in position on the wrist of a swimmer.

The broken lines in the drawing are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a swimming aid, as shown and described. 